HELP! My world has been turned

I have some how gotten my world axis out of whack. My floor grid has rotated and I have no idea how it happened. And I dont know how to fix it. Can anyone help? Everything is working ok. it is just off axis,

My floor grid has rotated and I have no idea how it happened. And I dont know how to fix it.
Use your mouse to rotate view ?

Everything is working ok
Good to know !

it is just off axis
What do you mean ? Screenshots etc etc

Never mind, I just found it. My mouse would not rotate everything (the whole scene) back to being straight up and down. I hit 1 and 3 on my number pad and everything went back to being square